.up {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100px;
  transition: all .2s;
  background-color: #fff;
}

.down {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100px;
  transition: all .2s;
  background-color: #fff;
}

.right {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 90%;
  transition: all .2s;
  background-color: #fff;
}

.left {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 90%;
  transition: all .2s;
  background-color: #fff;
}
